摘要
利用LB膜仪进行表面压力-面积(π-A)曲线测量,研究了四种金属离子对磷脂酰胆碱(PC)在空气/水界面上相形为特征的影响。经π-A曲线分析发现了离子的各种属性(离子半径、离子浓度、价态等)对Langmuir膜影响的规律,即金属离子的半径R越小、金属离子的浓度C越大、金属离子的价态Q越大,其对应的曲线特征量A0将会随之变小、相变点的变化将较为明显、崩溃压将随之变大、曲线也会外扩。金属离子的属性对Langmuir膜相形为特征的影响因素中,离子价态影响最大,其次是离子浓度,而离子半径影响较小。
The impact of metal ions on the phase behavior of phosphatidylcholine（PC） was investigated at the air/water interface by surface pressure-area（π-A） isotherm measurements.The analysis of the π-A isotherms showed that with the metal ionic radius decreasing,the concentration of the metal ions C increasing,and the valence of metal ions Q increasing,the amount of the corresponding curves of A0 decreases,the phase transition point would change more apparently,the collapse pressure would become larger subsequently,and the curve would be extended outside.The phenomenon could be approached when the metal ion concentration C became great enough.These experiments were identified with the rules on Langmuir films,by a variety of properties of metal ions（ion radius,ion concentration,ion valence,etc.）.Among all the factors,the ionic valence showed the greatest impact on the phase changes,followed by the ion concentration,while the ionic radius influences were less on the phase-change characteristics.
出处
《生物医学工程学杂志》
EI
CAS
CSCD
北大核心
2011年第2期296-299,共4页
Journal of Biomedical Engineering
